<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        body {
            font-size: 38px;
            line-height: 2.7;
            text-align: center;
            margin: 0px;
        }
        .toolbar {
            display: flex;
            justify-content:space-around
        }
        .main {
            height: 400px;
            overflow: auto;
            background-color: #364174;
            color: #fff;
            /* scroll-behavior: smooth; */
        }
    </style>
    <script>
        function test() {
            // const main = document.querySelector('.main');
            // main.scrollTop = 2317;
            const a40 = document.querySelector('#a40');
            a40.scrollIntoView({
                behavior: 'smooth'
            });
        }
    </script>
</head>
<body>

    <div class="toolbar">
        <a href="#a00">00</a>
        <a href="#a20">20</a>
        <a href="#a40">40</a>
        <button onclick="test()">test</button>
    </div>


    <div class="main">
        <a id="a00"></a>00<br/>01<br/>02<br/>03<br/>04<br/>05<br/>06<br/>07<br/>08<br/>09<br/>10<br/>11<br/>12<br/>13<br/>14<br/>15<br/>16<br/>17<br/>18<br/>19<br/>
        <a id="a20"></a>20<br/>21<br/>22<br/>23<br/>24<br/>25<br/>26<br/>27<br/>28<br/>29<br/>30<br/>31<br/>32<br/>33<br/>34<br/>35<br/>36<br/>37<br/>38<br/>39<br/>
        <a id="a40"></a>40<br/>41<br/>42<br/>43<br/>44<br/>45<br/>46<br/>47<br/>48<br/>49<br/>50<br/>51<br/>52<br/>53<br/>54<br/>55<br/>56<br/>57<br/>58<br/>59<br/>
    </div>



</body>
</html>